From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA53AC47082 for ; Mon, 31 May 2021 05:55:16 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 67EFC61090 for ; Mon, 31 May 2021 05:55:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 67EFC61090 Authentication-Results: mail.kernel.org; dmarc=fail (p=quarantine dis=none) header.from=midokura.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:52918 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lnatP-0004tF-Fj for qemu-devel@archiver.kernel.org; Mon, 31 May 2021 01:55:15 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:43748) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lnapX-00052p-PX for qemu-devel@nongnu.org; Mon, 31 May 2021 01:51:15 -0400 Received: from mail-pj1-x1036.google.com ([2607:f8b0:4864:20::1036]:33534) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1lnapW-0003qG-1x for qemu-devel@nongnu.org; Mon, 31 May 2021 01:51:15 -0400 Received: by mail-pj1-x1036.google.com with SMTP id k22-20020a17090aef16b0290163512accedso1149685pjz.0 for ; Sun, 30 May 2021 22:51:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=midokura.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=jZBlbfeu3NXCpv3F7hDFEvZVI/DgvLfsFk5ytNgoOU8=; b=bJfck3h20NHGnpqQRT+T2eDYLj+kBbtUmaE2JQgaBcHcVSyCLbSr88XQfl29FqXiyp ZXstTRQNJQn18TZiHsbl5Llv3NQJM4im4N2PfV2bvCNZJ8Z/RRhCsqTrInbAzFtL0kzB MrIrTsmlZPOg3TsBUgEppv6Q7KiOB+qtxoRxQ= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=jZBlbfeu3NXCpv3F7hDFEvZVI/DgvLfsFk5ytNgoOU8=; b=s3v48yyfPiul318XLnaoEpPtJ7mFB9D4dAUd8k0R0kFvUokBfHR7BATEcgLqnEijLJ Ck3EWbxhkeGdlP8kJXc8RQSeHSRKa80tQ1HfyDurtMhLjrfEX7E26rMTotrIdC/E6p3P uSnafYp1uikLKuaOZvVpIDhJHC9rvk8b0amgM17198q7n52HESGG8xPgRYOrwlydfAt/ M8Eajf9FuACBR1YLoyFKyoMqDTwjMxgYLSuZwPXomDhpl9KnRl5hXt9m7hKC8R30G8yM Bu1sIpjS7Ym5k5AzOrXRO4Op4M5jkm05C+CJmFG8slVmfUO9C459gpV4tP/PUBK1WkbP ID9A== X-Gm-Message-State: AOAM531yrTexEViUuiC04hq6j3hKavsNkmMAqbkgjs1OoiM6dZ9Y7P1v 9J63aGAmvpPMZHk+zvFUclb+3VpQUtxVwg== X-Google-Smtp-Source: ABdhPJwh1uedUhYhEmbjiMqyLbr0yJ5ksuTHLDs72YpRqsswRZ2KLPfCwelD8c0vWbzutyBjM17OLA== X-Received: by 2002:a17:90a:4e0b:: with SMTP id n11mr17391336pjh.155.1622440272659; Sun, 30 May 2021 22:51:12 -0700 (PDT) Received: from spacetanuki.lan ([202.12.244.32]) by smtp.gmail.com with ESMTPSA id b10sm4744058pfi.122.2021.05.30.22.51.11 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Sun, 30 May 2021 22:51:12 -0700 (PDT) From: YAMAMOTO Takashi To: qemu-devel@nongnu.org Cc: YAMAMOTO Takashi , Laurent Vivier Subject: [PATCH v2 05/11] linux-user: Implement pivot_root Date: Mon, 31 May 2021 14:50:12 +0900 Message-Id: <20210531055019.10149-6-yamamoto@midokura.com> X-Mailer: git-send-email 2.21.1 (Apple Git-122.3) In-Reply-To: <20210531055019.10149-1-yamamoto@midokura.com> References: <20210531055019.10149-1-yamamoto@midokura.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::1036; envelope-from=yamamoto@midokura.com; helo=mail-pj1-x1036.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Used by runc. Signed-off-by: YAMAMOTO Takashi --- linux-user/syscall.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index 2947e79dc0..51144c6d29 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8254,6 +8254,10 @@ static int host_to_target_cpu_mask(const unsigned long *host_mask, return 0; } +#if defined(TARGET_NR_pivot_root) && defined(__NR_pivot_root) +_syscall2(int, pivot_root, const char *, new_root, const char *, put_old) +#endif + /* This is an internal helper for do_syscall so that it is easier * to have a single return point, so that actions, such as logging * of syscall results, can be performed. @@ -13222,6 +13226,23 @@ static abi_long do_syscall1(void *cpu_env, int num, abi_long arg1, return ret; #endif +#if defined(TARGET_NR_pivot_root) + case TARGET_NR_pivot_root: + { + void *p2; + p = lock_user_string(arg1); /* new_root */ + p2 = lock_user_string(arg2); /* put_old */ + if (!p || !p2) { + ret = -TARGET_EFAULT; + } else { + ret = get_errno(pivot_root(p, p2)); + } + unlock_user(p2, arg2, 0); + unlock_user(p, arg1, 0); + } + return ret; +#endif + default: qemu_log_mask(LOG_UNIMP, "Unsupported syscall: %d\n", num); return -TARGET_ENOSYS; -- 2.21.1 (Apple Git-122.3)